diff --git a/python/mxnet/recordio.py b/python/mxnet/recordio.py
index 92ec1325a407..ca30f1c69f89 100644
--- a/python/mxnet/recordio.py
+++ b/python/mxnet/recordio.py
@@ -177,10 +177,14 @@ def pack_img(header, img, quality=80, img_fmt='.jpg'):
         The packed string
     """
     assert opencv_available
-    if img_fmt == '.jpg':
+    jpg_formats = set(['.jpg', '.jpeg', '.JPG', '.JPEG'])
+    png_formats = set(['.png', '.PNG'])
+    encode_params = None
+    if img_fmt in jpg_formats:
         encode_params = [cv2.IMWRITE_JPEG_QUALITY, quality]
-    elif img_fmt == '.png':
+    elif img_fmt in png_formats:
         encode_params = [cv2.IMWRITE_PNG_COMPRESSION, quality]
+
     ret, buf = cv2.imencode(img_fmt, img, encode_params)
     assert ret, 'failed encoding image'
     return pack(header, buf.tostring())